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stb_divide: use return value to indicate errors

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yangfl 2019-04-04 11:38:56 +08:00
parent c72a95d766
commit 5db48d3604
1 changed files with 14 additions and 6 deletions
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20
stb_divide.h
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@ -275,24 +275,32 @@ int stb_mod_eucl(int v1, int v2)
#include <limits.h> #include <limits.h>
int show=0; int show=0;
int err=0;
void stbdiv_check(int q, int r, int a, int b, char *type, int dir) void stbdiv_check(int q, int r, int a, int b, char *type, int dir)
{ {
if ((dir > 0 && r < 0) || (dir < 0 && r > 0)) if ((dir > 0 && r < 0) || (dir < 0 && r > 0)) {
fprintf(stderr, "FAILED: %s(%d,%d) remainder %d in wrong direction\n", type,a,b,r); fprintf(stderr, "FAILED: %s(%d,%d) remainder %d in wrong direction\n", type,a,b,r);
else err++;
} else
if (b != INT_MIN) // can't compute abs(), but if b==INT_MIN all remainders are valid if (b != INT_MIN) // can't compute abs(), but if b==INT_MIN all remainders are valid
if (r <= -abs(b) || r >= abs(b)) if (r <= -abs(b) || r >= abs(b)) {
fprintf(stderr, "FAILED: %s(%d,%d) remainder %d out of range\n", type,a,b,r); fprintf(stderr, "FAILED: %s(%d,%d) remainder %d out of range\n", type,a,b,r);
err++;
}
#ifdef STB_DIVIDE_TEST_64 #ifdef STB_DIVIDE_TEST_64
{ {
STB_DIVIDE_TEST_64 q64 = q, r64=r, a64=a, b64=b; STB_DIVIDE_TEST_64 q64 = q, r64=r, a64=a, b64=b;
if (q64*b64+r64 != a64) if (q64*b64+r64 != a64) {
fprintf(stderr, "FAILED: %s(%d,%d) remainder %d doesn't match quotient %d\n", type,a,b,r,q); fprintf(stderr, "FAILED: %s(%d,%d) remainder %d doesn't match quotient %d\n", type,a,b,r,q);
err++;
}
} }
#else #else
if (q*b+r != a) if (q*b+r != a) {
fprintf(stderr, "FAILED: %s(%d,%d) remainder %d doesn't match quotient %d\n", type,a,b,r,q); fprintf(stderr, "FAILED: %s(%d,%d) remainder %d doesn't match quotient %d\n", type,a,b,r,q);
err++;
}
#endif #endif
} }
@ -372,7 +380,7 @@ int main(int argc, char **argv)
testh(INT_MIN , INT_MAX); testh(INT_MIN , INT_MAX);
testh(INT_MIN+1, INT_MAX); testh(INT_MIN+1, INT_MAX);
return 0; return err > 0 ? 1 : 0;
} }
#endif // STB_DIVIDE_TEST #endif // STB_DIVIDE_TEST
#endif // STB_DIVIDE_IMPLEMENTATION #endif // STB_DIVIDE_IMPLEMENTATION